| Parameter |
Value |
| Designation |
C/2000 D2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-03-08T14:43:54.082560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:04Z |
| Obs used |
79 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2000-03-01.0000000 |
| e |
0.86703438 |
| q (au) |
2.297610 |
| a (au) |
17.279730 |
| i (deg) |
156.991926 |
| Ω (om, deg) |
235.887153 |
| ω (w, deg) |
117.682679 |
| M (ma, deg) |
359.895528 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.087 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.087 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
21:00:31.89 |
-39:39:03.7 |
HIP 103662 |
27.95 |
| 2026-05-12 12:00 |
21:00:30.90 |
-39:39:28.4 |
HIP 103662 |
27.52 |
| 2026-05-13 00:00 |
21:00:29.87 |
-39:39:53.2 |
HIP 103662 |
27.08 |
| 2026-05-13 12:00 |
21:00:28.80 |
-39:40:18.2 |
HIP 103662 |
26.65 |
| 2026-05-14 00:00 |
21:00:27.69 |
-39:40:43.2 |
HIP 103662 |
26.21 |
| 2026-05-14 12:00 |
21:00:26.53 |
-39:41:08.4 |
HIP 103662 |
25.77 |
| 2026-05-15 00:00 |
21:00:25.34 |
-39:41:33.7 |
HIP 103662 |
25.32 |
| 2026-05-15 12:00 |
21:00:24.10 |
-39:41:59.0 |
HIP 103662 |
24.88 |
| 2026-05-16 00:00 |
21:00:22.83 |
-39:42:24.5 |
HIP 103662 |
24.44 |
| 2026-05-16 12:00 |
21:00:21.51 |
-39:42:50.1 |
HIP 103662 |
23.99 |
| 2026-05-17 00:00 |
21:00:20.15 |
-39:43:15.7 |
HIP 103662 |
23.55 |
| 2026-05-17 12:00 |
21:00:18.75 |
-39:43:41.5 |
HIP 103662 |
23.10 |
| 2026-05-18 00:00 |
21:00:17.31 |
-39:44:07.3 |
HIP 103662 |
22.66 |
| 2026-05-18 12:00 |
21:00:15.83 |
-39:44:33.3 |
HIP 103662 |
22.22 |
| 2026-05-19 00:00 |
21:00:14.31 |
-39:44:59.3 |
HIP 103662 |
21.78 |
| 2026-05-19 12:00 |
21:00:12.74 |
-39:45:25.4 |
HIP 103662 |
21.34 |
| 2026-05-20 00:00 |
21:00:11.14 |
-39:45:51.6 |
HIP 103662 |
20.91 |
| 2026-05-20 12:00 |
21:00:09.50 |
-39:46:17.8 |
HIP 103662 |
20.47 |
| 2026-05-21 00:00 |
21:00:07.81 |
-39:46:44.2 |
HIP 103662 |
20.05 |
| 2026-05-21 12:00 |
21:00:06.09 |
-39:47:10.6 |
HIP 103662 |
19.62 |
| 2026-05-22 00:00 |
21:00:04.32 |
-39:47:37.1 |
HIP 103662 |
19.21 |
| 2026-05-22 12:00 |
21:00:02.52 |
-39:48:03.6 |
HIP 103662 |
18.80 |
| 2026-05-23 00:00 |
21:00:00.67 |
-39:48:30.3 |
HIP 103662 |
18.40 |
| 2026-05-23 12:00 |
20:59:58.79 |
-39:48:57.0 |
HIP 103662 |
18.00 |
| 2026-05-24 00:00 |
20:59:56.86 |
-39:49:23.7 |
HIP 103662 |
17.62 |
| 2026-05-24 12:00 |
20:59:54.90 |
-39:49:50.6 |
HIP 103662 |
17.25 |
| 2026-05-25 00:00 |
20:59:52.90 |
-39:50:17.4 |
HIP 103662 |
16.89 |
| 2026-05-25 12:00 |
20:59:50.85 |
-39:50:44.4 |
HIP 103662 |
16.54 |
| 2026-05-26 00:00 |
20:59:48.77 |
-39:51:11.4 |
HIP 103662 |
16.22 |
| 2026-05-26 12:00 |
20:59:46.65 |
-39:51:38.5 |
HIP 103662 |
15.90 |
| 2026-05-27 00:00 |
20:59:44.49 |
-39:52:05.6 |
HIP 103662 |
15.61 |
| 2026-05-27 12:00 |
20:59:42.29 |
-39:52:32.7 |
HIP 103662 |
15.34 |
| 2026-05-28 00:00 |
20:59:40.05 |
-39:53:00.0 |
HIP 103662 |
15.09 |
| 2026-05-28 12:00 |
20:59:37.77 |
-39:53:27.2 |
HIP 103662 |
14.87 |
| 2026-05-29 00:00 |
20:59:35.46 |
-39:53:54.5 |
HIP 103662 |
14.67 |
| 2026-05-29 12:00 |
20:59:33.10 |
-39:54:21.8 |
HIP 103662 |
14.50 |
| 2026-05-30 00:00 |
20:59:30.71 |
-39:54:49.2 |
HIP 103662 |
14.36 |
| 2026-05-30 12:00 |
20:59:28.28 |
-39:55:16.7 |
HIP 103662 |
14.25 |
| 2026-05-31 00:00 |
20:59:25.81 |
-39:55:44.1 |
HIP 103662 |
14.18 |
| 2026-05-31 12:00 |
20:59:23.31 |
-39:56:11.6 |
HIP 103662 |
14.14 |
| 2026-06-01 00:00 |
20:59:20.76 |
-39:56:39.2 |
HIP 103662 |
14.14 |
| 2026-06-01 12:00 |
20:59:18.18 |
-39:57:06.7 |
HIP 103662 |
14.17 |
| 2026-06-02 00:00 |
20:59:15.56 |
-39:57:34.3 |
HIP 103662 |
14.24 |